Editing Sioux County, North Dakota (section)

==Geography==
Sioux County lies on the south line of North Dakota. Its south boundary line abuts the north boundary line of the state of [[South Dakota]]. Its north boundary line is formed by the east-northeastward-flowing [[Cedar Creek (North Dakota)|Cedar Creek]], which discharges into the [[Missouri River]] at the county's northeast corner, and its east boundary line is formed by the south-southeast-flowing Missouri River, which also forms [[Lake Oahe]] along the county boundary line. Porcupine Creek flows southeastward into the Missouri River, draining the northeastern part of the county. The county terrain consists of low rolling hills etched with gullies and drainages; the area is mostly devoted to agriculture.<ref name="SCND">{{Cite web|title=Sioux County · North Dakota |url=https://www.google.com/maps/place/Sioux+County,+ND/@46.0636623,-101.1048188,45979m/data=!3m1!1e3!4m5!3m4!1s0x52d62ad641eaa293:0x37b5b547f4bd3ed9!8m2!3d46.0512004!4d-101.1175392 |access-date=April 27, 2024 |website=Google Maps |language=en}}</ref> The terrain slopes to the east and south; its highest point is on the west line, near the southwestern corner of the county, at {{convert|2,602|ft|m|abbr=on}} ASL.<ref>{{Cite web|title="Find an Altitude/Sioux County ND" Google Maps (accessed February 22, 2019) |url=https://www.daftlogic.com/sandbox-google-maps-find-altitude.htm |access-date=February 22, 2019 |archive-url=https://web.archive.org/web/20190521043409/https://www.daftlogic.com/sandbox-google-maps-find-altitude.htm |archive-date=May 21, 2019 |url-status=dead}}</ref>

According to the [[United States Census Bureau]], the county has a total area of {{convert|1128.203|sqmi}}, of which {{convert|1094.052|sqmi}} is land and {{convert|34.151|sqmi}} (3.03%) is water.<ref>{{Cite web|title=2024 County Gazetteer Files – North Dakota|url=https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_gaz_counties_38.txt|publisher=[[United States Census Bureau]]|access-date=March 28, 2025}}</ref> It is the 34th largest county in North Dakota by total area.

The southwest corner counties of North Dakota (Adams, Billings, Bowman, Golden Valley, Grant, Hettinger, Slope, and Stark) observe [[Mountain Time Zone|Mountain Time]]. The counties of McKenzie, Dunn, and Sioux are split, observing Mountain Time in their western portions.

===Major highways===
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* [[Image:ND-6 (2015).svg|25px]] [[North Dakota Highway 6]]
* [[Image:ND-24 (2015).svg|25px]] [[North Dakota Highway 24]]
* [[Image:ND-31 (2015).svg|25px]] [[North Dakota Highway 31]]
* [[Image:ND-49 (2015).svg|25px]] [[North Dakota Highway 49]]
* [[Image:ND-1806 (2015).svg|25px]] [[North Dakota Highway 1806]]
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===Adjacent counties===
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* [[Morton County, North Dakota|Morton County]] - north (observes [[Central Time Zone|Central Time]])
* [[Emmons County, North Dakota|Emmons County]] - east (observes Central Time)
* [[Corson County, South Dakota]] - south (observes [[Mountain Time Zone|Mountain Time]])
* [[Adams County, North Dakota|Adams County]] - west (observes Mountain Time)
* [[Grant County, North Dakota|Grant County]] - northwest (observes Mountain Time)
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===Protected areas<ref name=SCND/>===
* [[Cedar River National Grassland]] (part)
* Froelich Dam State Game Management Area